Expansion shield



July 25, 1933. T J, NOONAN 1,919,901

EXPANSION SHIELD Filed Oct. 30, 1931 INVENTOR 760074: f. 4 00/24 BY I HATTORNEYS tions 1 i Patented it i 2 5, 1 933 i STATES W-to es a moms rl noolvniilor suemsjmw qnnsnv ssrsnon ro :J. nnwenn semen;

Pm, me, QFEAT onnivengnnw JERS Y, nqconronerron or new-J RSEY EXPAN ION. SHIELD n piieationflmedbeater 30,1931 skin are/572,007.

This invention relates to expansion shields a for use lnforminganchorages in brick, stone or cementitious materiallto directly receive andjretain a threaded elementw A shields is the two-section ort o-Way shield i inwhich thesections: are laterally expanded 1 in opposite directions,

This shield is ef} fective andefiicientnnder most conditions .1 but under certain conditions tends to split the material in which itisi set or expanded 1 since all of the expansion stress isyex'erted inmoppositedirections. Moreover, as the c two sections are separated or spread apart 2.15

during expansion there 'areYformed gaps therebetween where there 1s jno gripping "ac- This. invention tical in construction, comprises a minimurn anchorage. a a a HAnotherobject of the'invention is to provide an .anchor or expansion shield so constructed and arranged that .the expansion 1 stress will bedistributed in more than two directions and a greater gripping and hold ing power will be secured than is secured with the'two-way expansion shield. v

Another object of the inventionjis to provide an anchorage having the characteristics and advantages set forth that canbe' ecofnomically manufactured. 1 V.

pear from the following specification taken in connection with the drawing which forms a part of this application,and in which Fig. 1 is an elevational view of an expansionshield constructed in accordance with "140 i i the invention; f a i v a Fig.2 is an end elevationof'the shield shown inlfiig.'l; it i c a Fig. 3 's a longitudinal sectional elevation 1 taken at right'angles to Fig. 2 and substanv H tially on line 3+3 ofFig. 2; i a Fig. 4 is a transverse sectional elevatio taken substantially on line 4% of Fig. 1; c

Fig. 5 is an elevational view of one seotion of the shield looking at the inside of the shield; i I V has for its 'salient object' to provide an anchor'th at is simpleandprac- 5 number of parts and will form aneflicient Further objects of the invention will ap 'O and D of the section Aare also ;.at 31 and 32. The taperedportions of the 6 isasimilar view oi the othersec tionofth shields F1g;"7 is an end elevation of one end'fof the expand ng element or nut; and One of the; commonest formsofexpansion tions, one of the sections having aplurality of expansible portions. The shield is further provided with means arranged meoact With the expanding element or nutyto prevent rotationof the nut as the latter moves into the shield-and expands the shield;

pear from'the followingdescription.

*llrther details' of the inventienwwi11-a l In the form of the inventionillustrated in; the drawing therefiis shown anaexpension shield comprising a pair"'ot*sections"Aand B, a The shield sections are so formed asto providea groove 10 adjacent'theouter end and center thereof. one ofthe sections, such as A, is provided with a :[pair' Ofgllftbd 12 and 13 which seat in the portion oi -theirs a groove 11 formed in the other section. 1 The section .B is provided along i its 10112 a groove 11 nearer therlongitudinal j' gitudinal edgeswith a pair of fingers 15 i tend over the outer end of the expanding element or nut 18. c

The section A has longitudinal slits 21 and 16 having inturned ends 17 which ex- 1 and 22 which. formant elongated finger 23 having inturned end portion 24. The slits r divide the section A into (land D which are 23.

expansible portions separated by the finger The expandingelement or nut 18 is pro vided with three tapered projecting portions 25, 26 and.27 whichqare disposed between the fingers 15, 23 and 16 and the portions of the nut disposed within these fingers and indicated at 28 are cylindrical.

The section B is tapered at its inner end,

as shown at'30, and the expa nsible portions tapered force the expansible portions of the shield ing stress will be exerted in three directions,

or in other words, against the section B and against the portions C and D of the section A. In addition to distributing the expanding stress in this manner the shield will have a firmer gripping action due to the three-way expansion. F urthermore, since the shield is formed in two sections it can be readily cast without necessitating the use of a core or cores which would be required if the shield were formed-in three sections, integrally'connected.

Although one specific embodiment ofthe invention has been particularly shown and described it will be understood that the in vention is capable ofinodification and that changes in the construetionand in the ar- 'vrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims.

What I claim is:

l. A two section, three-way cast metal expension shield comprising a pair of semicylindrical sections, one section only comprising a pair of expansible portions, and an expanding member in said shield having tapered portions arranged to expand the two expansible portions and the other shield section. 4 I V 2. A two section, three-way cast metal expansionshiel-d comprising a pair of semicylindrical sections, one section only coinprising a pair of expansible portions, and an expanding member in said shield having tapered portions arranged to expand the two expansible portions and the other shield section, said last named section provided with a pair of fingers engaging the expanding member for preventing rotation thereof.

3. A two section, three-way cast metal expansion shield comprising a pair. of semicylindrical sections, one section only comprising a pair of expansible portions, and an expanding memberin said shield having tapered portions arranged to expand the two expansible portions and the other shield section, said last named section provided with a pair of fingers engaging the expanding member for preventing rotation thereof and said other section having a finger intermediate the edges thereof.

4. A two section, three-way castmetal expansion shield comprising a pair of semi-ey lindrical sections, one section only comprising a pair of expansihle portions, and an expanding member in said shield having tapered portionsarranged to expand the two expansible portions and the other shield section, said last named section provided with a pair of fingers engaging the expanding member for preventing rotation thereof and said other section having a finger intermediate the edges thereof and between the expansible portions of said section 5. A two section, three-way cast metal expansion shield comprising a pair of semi-cylindrical sections, one section only comprising a pair of expansible portions, and an expandingmember in said shield having ta pered portions arranged to expand the two expansible portions and the other shield section, said last named section provided with a pair of fingers adjacent the edges of said section and engaging the expanding member for preventing rotation thereof.

THOMAS J. NOONAN. 

